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    <h1>notabs
      <small>Subroutine</small>
    
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    <h2>
public impure elemental subroutine notabs(instr, outstr, lgth)
    
    
   
</h2>
    
  


    
    <h2 id="name">NAME</h2>
<div class="codehilite"><pre><span></span><code>notabs(3f) - [M_strings:NONALPHA] expand tab characters
(LICENSE:PD)
</code></pre></div>

<h2 id="synopsis">SYNOPSIS</h2>
<div class="codehilite"><pre><span></span><code>subroutine notabs(INSTR,OUTSTR,lgth)

 character(len=*),intent=(in)  :: INSTR
 character(len=*),intent=(out) :: OUTSTR
 integer,intent=(out)          :: lgth
</code></pre></div>

<h2 id="description">DESCRIPTION</h2>
<div class="codehilite"><pre><span></span><code> <span class="nv">NOTABS</span><span class="ss">()</span> <span class="nv">converts</span> <span class="nv">tabs</span> <span class="nv">in</span> <span class="nv">INSTR</span> <span class="nv">to</span> <span class="nv">spaces</span> <span class="nv">in</span> <span class="nv">OUTSTR</span> <span class="k">while</span> <span class="nv">maintaining</span>
 <span class="nv">columns</span>. <span class="nv">It</span> <span class="nv">assumes</span> <span class="nv">a</span> <span class="nv">tab</span> <span class="nv">is</span> <span class="nv">set</span> <span class="nv">every</span> <span class="mi">8</span> <span class="nv">characters</span>. <span class="nv">Trailing</span> <span class="nv">spaces</span>
 <span class="nv">are</span> <span class="nv">removed</span>.

 <span class="nv">In</span> <span class="nv">addition</span>, <span class="nv">trailing</span> <span class="nv">carriage</span> <span class="nv">returns</span> <span class="nv">and</span> <span class="nv">line</span> <span class="nv">feeds</span> <span class="nv">are</span> <span class="nv">removed</span>
 <span class="ss">(</span><span class="nv">they</span> <span class="nv">are</span> <span class="nv">usually</span> <span class="nv">a</span> <span class="nv">problem</span> <span class="nv">created</span> <span class="nv">by</span> <span class="nv">going</span> <span class="nv">to</span> <span class="nv">and</span> <span class="nv">from</span> <span class="nv">MSWindows</span><span class="ss">)</span>.

 <span class="nv">What</span> <span class="nv">are</span> <span class="nv">some</span> <span class="nv">reasons</span> <span class="k">for</span> <span class="nv">removing</span> <span class="nv">tab</span> <span class="nv">characters</span> <span class="nv">from</span> <span class="nv">an</span> <span class="nv">input</span> <span class="nv">line</span>?
 <span class="nv">Some</span> <span class="nv">Fortran</span> <span class="nv">compilers</span> <span class="nv">have</span> <span class="nv">problems</span> <span class="nv">with</span> <span class="nv">tabs</span>, <span class="nv">as</span> <span class="nv">tabs</span> <span class="nv">are</span> <span class="nv">not</span>
 <span class="nv">part</span> <span class="nv">of</span> <span class="nv">the</span> <span class="nv">Fortran</span> <span class="nv">character</span> <span class="nv">set</span>. <span class="nv">Some</span> <span class="nv">editors</span> <span class="nv">and</span> <span class="nv">printers</span> <span class="nv">will</span>
 <span class="nv">have</span> <span class="nv">problems</span> <span class="nv">with</span> <span class="nv">tabs</span>. <span class="nv">It</span> <span class="nv">is</span> <span class="nv">often</span> <span class="nv">useful</span> <span class="nv">to</span> <span class="nv">expand</span> <span class="nv">tabs</span> <span class="nv">in</span> <span class="nv">input</span>
 <span class="nv">files</span> <span class="nv">to</span> <span class="nv">simplify</span> <span class="nv">further</span> <span class="nv">processing</span> <span class="nv">such</span> <span class="nv">as</span> <span class="nv">tokenizing</span> <span class="nv">an</span> <span class="nv">input</span> <span class="nv">line</span>.
</code></pre></div>

<h2 id="options">OPTIONS</h2>
<div class="codehilite"><pre><span></span><code> instr     Input line to remove tabs from
</code></pre></div>

<h2 id="results">RESULTS</h2>
<div class="codehilite"><pre><span></span><code> outstr    Output string with tabs expanded. Assumed to be of sufficient
           length
 lgth      Significant length of returned string
</code></pre></div>

<h2 id="examples">EXAMPLES</h2>
<p>Sample program:</p>
<div class="codehilite"><pre><span></span><code><span class="nv">program</span> <span class="nv">demo_notabs</span>

<span class="o">!</span>  <span class="nv">test</span> <span class="nv">filter</span> <span class="nv">to</span> <span class="nv">remove</span> <span class="nv">tabs</span> <span class="nv">and</span> <span class="nv">trailing</span> <span class="nv">white</span> <span class="nv">space</span> <span class="nv">from</span> <span class="nv">input</span>
<span class="o">!</span>  <span class="nv">on</span> <span class="nv">files</span> <span class="nv">up</span> <span class="nv">to</span> <span class="mi">1024</span> <span class="nv">characters</span> <span class="nv">wide</span>
<span class="nv">use</span> <span class="nv">M_strings</span>, <span class="nv">only</span> : <span class="nv">notabs</span>
<span class="nv">character</span><span class="ss">(</span><span class="nv">len</span><span class="o">=</span><span class="mi">1024</span><span class="ss">)</span> :: <span class="nv">in</span>,<span class="nv">out</span>
<span class="nv">integer</span>             :: <span class="nv">ios</span>,<span class="nv">iout</span>
   <span class="k">do</span>
      <span class="nv">read</span><span class="ss">(</span><span class="o">*</span>,<span class="s1">&#39;</span><span class="s">(A)</span><span class="s1">&#39;</span>,<span class="nv">iostat</span><span class="o">=</span><span class="nv">ios</span><span class="ss">)</span><span class="nv">in</span>
      <span class="k">if</span><span class="ss">(</span><span class="nv">ios</span> <span class="o">/=</span> <span class="mi">0</span><span class="ss">)</span> <span class="k">exit</span>
      <span class="k">call</span> <span class="nl">notabs</span><span class="ss">(</span><span class="nv">in</span>,<span class="nv">out</span>,<span class="nv">iout</span><span class="ss">)</span>
      <span class="nv">write</span><span class="ss">(</span><span class="o">*</span>,<span class="s1">&#39;</span><span class="s">(a)</span><span class="s1">&#39;</span><span class="ss">)</span><span class="nv">out</span><span class="ss">(</span>:<span class="nv">iout</span><span class="ss">)</span>
   <span class="nv">enddo</span>
<span class="k">end</span> <span class="nv">program</span> <span class="nv">demo_notabs</span>
</code></pre></div>

<h2 id="see-also">SEE ALSO</h2>
<div class="codehilite"><pre><span></span><code> GNU/Unix commands expand(1) and unexpand(1)
</code></pre></div>

<h2 id="author">AUTHOR</h2>
<div class="codehilite"><pre><span></span><code> John S. Urban
</code></pre></div>

<h2 id="license">LICENSE</h2>
<div class="codehilite"><pre><span></span><code>Public Domain
</code></pre></div>
    

    <h3>Arguments</h3>
    
      
<table class="table table-striped varlist">
<thead><tr><th>Type</th>
<th>Intent</th><th>Optional</th>
<th>Attributes</th><th></th><th>Name</th><th></th></thead>



<tbody>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-instr~3"></span>character(len=*),</td>
  <td>intent(in)</td>
  <td></td>
  
  <td></td><td>::</td>
  <td><strong>instr</strong></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-outstr~5"></span>character(len=*),</td>
  <td>intent(out)</td>
  <td></td>
  
  <td></td><td>::</td>
  <td><strong>outstr</strong></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-lgth~8"></span>integer,</td>
  <td>intent(out)</td>
  <td></td>
  
  <td></td><td>::</td>
  <td><strong>lgth</strong></td><td></td>
  
</tr>

</tbody>
</table>

    
    
    
    
     
    <br>

    <section class="visible-xs visible-sm hidden-md">
      
<h3>Contents</h3>
 



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  <div class="panel-heading text-left"><h3 class="panel-title"><a data-toggle="collapse" href="#vars-1">Variables</a></h3></div>
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      <a class="list-group-item" href="../proc/notabs.html#variable-c~3">c</a>
      
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  <div class="panel-heading text-left"><h3 class="panel-title">Source Code</h3></div>
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    <a class="list-group-item" href="../proc/notabs.html#src">notabs</a>
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    <br class="visible-xs visible-sm hidden-md">

    

    
    <section>    
      <h2>Variables</h2>
    
<table class="table table-striped varlist">
<thead><tr><th>Type</th><th>Visibility</th>

<th>Attributes</th><th></th><th>Name</th><th></th><th>Initial</th><th></th></thead>



<tbody>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-c~3"></span>character(len=1),</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>c</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-iade"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>iade</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-ipos~2"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>ipos</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-istep"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>istep</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-lenin"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>lenin</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-lenout"></span>integer,</td>
  
  <td>public</td>
  <td></td><td>::</td>
  <td><strong>lenout</strong></td><td></td><td></td><td></td>
  
</tr>

  
  
  
  
<tr>
  
  <td><span class="anchor" id="variable-tabsize"></span>integer,</td>
  
  <td>public,</td>
  <td>parameter</td><td>::</td>
  <td><strong>tabsize</strong></td><td> =</td><td>8</td><td></td>
  
</tr>

</tbody>
</table>

    </section>
    <br>
    
    
    
    
    

    
    
    
    
    


    
    
    
    <section>
    <h2><span class="anchor" id="src"></span>Source Code</h2>
    <div class="highlight"><pre><span></span><span class="k">elemental impure subroutine </span><span class="n">notabs</span><span class="p">(</span><span class="n">instr</span><span class="p">,</span><span class="n">outstr</span><span class="p">,</span><span class="n">lgth</span><span class="p">)</span>

<span class="c">! ident_31=&quot;@(#)M_strings::notabs(3f): convert tabs to spaces while maintaining columns, remove CRLF chars&quot;</span>

<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="k">intent</span><span class="p">(</span><span class="n">in</span><span class="p">)</span>   <span class="kd">::</span> <span class="n">instr</span>        <span class="c">! input line to scan for tab characters</span>
<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=*</span><span class="p">),</span><span class="k">intent</span><span class="p">(</span><span class="n">out</span><span class="p">)</span>  <span class="kd">::</span> <span class="n">outstr</span>       <span class="c">! tab-expanded version of INSTR produced</span>
<span class="kt">integer</span><span class="p">,</span><span class="k">intent</span><span class="p">(</span><span class="n">out</span><span class="p">)</span>           <span class="kd">::</span> <span class="n">lgth</span>         <span class="c">! column position of last character put into output string</span>
                                              <span class="c">! that is, lgth holds the position of the last non-blank character in OUTSTR</span>
<span class="c">!===================================================================================================================================</span>
<span class="kt">integer</span><span class="p">,</span><span class="k">parameter</span>             <span class="kd">::</span> <span class="n">tabsize</span><span class="o">=</span><span class="mi">8</span>    <span class="c">! assume a tab stop is set every 8th column</span>
<span class="kt">integer</span>                       <span class="kd">::</span> <span class="n">ipos</span>         <span class="c">! position in OUTSTR to put next character of INSTR</span>
<span class="kt">integer</span>                       <span class="kd">::</span> <span class="n">lenin</span>        <span class="c">! length of input string trimmed of trailing spaces</span>
<span class="kt">integer</span>                       <span class="kd">::</span> <span class="n">lenout</span>       <span class="c">! number of characters output string can hold</span>
<span class="kt">integer</span>                       <span class="kd">::</span> <span class="n">istep</span>        <span class="c">! counter that advances thru input string INSTR one character at a time</span>
<span class="kt">character</span><span class="p">(</span><span class="nb">len</span><span class="o">=</span><span class="mi">1</span><span class="p">)</span>              <span class="kd">::</span> <span class="n">c</span>            <span class="c">! character in input line being processed</span>
<span class="kt">integer</span>                       <span class="kd">::</span> <span class="n">iade</span>         <span class="c">! ADE (ASCII Decimal Equivalent) of character being tested</span>
<span class="c">!===================================================================================================================================</span>
   <span class="n">ipos</span><span class="o">=</span><span class="mi">1</span>                                     <span class="c">! where to put next character in output string OUTSTR</span>
   <span class="n">lenin</span><span class="o">=</span><span class="nb">len_trim</span><span class="p">(</span><span class="n">instr</span><span class="p">(</span> <span class="mi">1</span><span class="p">:</span><span class="nb">len</span><span class="p">(</span><span class="n">instr</span><span class="p">)</span> <span class="p">))</span>      <span class="c">! length of INSTR trimmed of trailing spaces</span>
   <span class="n">lenout</span><span class="o">=</span><span class="nb">len</span><span class="p">(</span><span class="n">outstr</span><span class="p">)</span>                         <span class="c">! number of characters output string OUTSTR can hold</span>
   <span class="n">outstr</span><span class="o">=</span><span class="s2">&quot; &quot;</span>                                 <span class="c">! this SHOULD blank-fill string, a buggy machine required a loop to set all characters</span>
<span class="c">!===================================================================================================================================</span>
      <span class="n">SCAN_LINE</span><span class="p">:</span> <span class="k">do </span><span class="n">istep</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span><span class="n">lenin</span>             <span class="c">! look through input string one character at a time</span>
         <span class="n">c</span><span class="o">=</span><span class="n">instr</span><span class="p">(</span><span class="n">istep</span><span class="p">:</span><span class="n">istep</span><span class="p">)</span>                 <span class="c">! get next character</span>
         <span class="n">iade</span><span class="o">=</span><span class="nb">iachar</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>                       <span class="c">! get ADE of the character</span>
         <span class="n">EXPAND_TABS</span> <span class="p">:</span> <span class="k">select case</span> <span class="p">(</span><span class="n">iade</span><span class="p">)</span>     <span class="c">! take different actions depending on which character was found</span>
         <span class="k">case</span><span class="p">(</span><span class="mi">9</span><span class="p">)</span>                              <span class="c">! test if character is a tab and move pointer out to appropriate column</span>
            <span class="n">ipos</span> <span class="o">=</span> <span class="n">ipos</span> <span class="o">+</span> <span class="p">(</span><span class="n">tabsize</span> <span class="o">-</span> <span class="p">(</span><span class="nb">mod</span><span class="p">(</span><span class="n">ipos</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="n">tabsize</span><span class="p">)))</span>
         <span class="k">case</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">13</span><span class="p">)</span>                          <span class="c">! convert carriage-return and new-line to space ,typically to handle DOS-format files</span>
            <span class="n">ipos</span><span class="o">=</span><span class="n">ipos</span><span class="o">+</span><span class="mi">1</span>
         <span class="k">case </span><span class="n">default</span>                         <span class="c">! c is anything else other than a tab,newline,or return  insert it in output string</span>
            <span class="k">if</span><span class="p">(</span><span class="n">ipos</span> <span class="o">&gt;</span> <span class="n">lenout</span><span class="p">)</span><span class="k">then</span>
<span class="k">               call </span><span class="n">journal</span><span class="p">(</span><span class="s2">&quot;*notabs* output string overflow&quot;</span><span class="p">)</span>
               <span class="k">exit</span>
<span class="k">            else</span>
<span class="k">               </span><span class="n">outstr</span><span class="p">(</span><span class="n">ipos</span><span class="p">:</span><span class="n">ipos</span><span class="p">)</span><span class="o">=</span><span class="n">c</span>
               <span class="n">ipos</span><span class="o">=</span><span class="n">ipos</span><span class="o">+</span><span class="mi">1</span>
            <span class="k">endif</span>
<span class="k">         end select </span><span class="n">EXPAND_TABS</span>
      <span class="k">enddo </span><span class="n">SCAN_LINE</span>
<span class="c">!===================================================================================================================================</span>
      <span class="n">ipos</span><span class="o">=</span><span class="nb">min</span><span class="p">(</span><span class="n">ipos</span><span class="p">,</span><span class="n">lenout</span><span class="p">)</span>                   <span class="c">! tabs or newline or return characters or last character might have gone too far</span>
      <span class="n">lgth</span><span class="o">=</span><span class="nb">len_trim</span><span class="p">(</span><span class="n">outstr</span><span class="p">(:</span><span class="n">ipos</span><span class="p">))</span>            <span class="c">! trim trailing spaces</span>
<span class="c">!===================================================================================================================================</span>
<span class="k">end subroutine </span><span class="n">notabs</span>
</pre></div>

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            Documentation generated by 
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             on 2022-01-16 22:32  
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